CTA
Instruction Manual
MPE
Reference: MT0027DA
This document may be modified without prior notice
15
Revision date: 11/05/06
Even partial reproduction is prohibited without authorisation in writing
11
Troubleshooting
PROBLEM
CAUSE
SYMPTOM
REMEDY
A. Dew point
too high
Compressed air temperature too high.
The digital display panel indicates
a value > 4C° permanently
Return the air inlet temperature to
within the limits.
Compressed air flow rate too high.
Ditto
Correct the air flow rate to within the
limits of the drier.
Compressed air pressure too low.
Ditto
Correct the pressure to within the
limits.
Ambient temperature Too high.
Ditto
Correct the temperature to within the
limits.
Dirty fins of the condenser.
Ditto
Clean the condensing unit fins.
Condensing unit face clogged.
Ditto
Clean the condensing unit face.
The fan runs backwards (three-phase)
Ditto
Correct electrical connection (phase
inversion)
Refrigerant gas leak
•
The compressor runs all the time
•
The compressor top is very hot;
Find the leak and repair it.
The HP Pressure switch has tripped
The digital display panel is OFF
See note E.
B.
Excessive drop
in compressed
air pressure.
Compressed air flow rate too high.
Pressure downstream from the drier
lower than the expected value.
Reduce the compressed air flow
rate.
Condensates Frozen.
Pressure downstream from the drier
lower than the expected value.
See note C.
Exchanger Tubes soiled by impurities in
the compressed air.
Pressure downstream from the drier
lower than the expected value.
Wash the heat exchanger tubes with
a non-aggressive detergent solution.
Check the filter upstream from the
drier.
C.
Compressed air
does not flow
through the
drier.
The condensates have frozen and block
the passage as the probe is incorrectly
positioned.
Compressed air does not flow through
the drier.
Position the probe in the centre of
the DTM heat exchanger.
The condensates have frozen and block
the passage as the set point is
programmed too low.
After the starting the compressor, value
0 is reached in less than 2 minutes.
Increase the set point value.
The condensates have frozen and block
the passage as the electronic controller
has failed.
The compressor stops.
The compressor does not stop even if
the digital display panel indicates 0
several minutes.
See note H.
Change the electronic board
D.
The solenoid valve coil has failed.
No condensates or air are expelled
when the TEST Button is pressed.
Replace the solenoid valve coil.
The purge circuit is clogged
The purge filter is dirty.
Clean the filter
The solenoid purge valve opening time is
insufficiently long time.
No condensates or air are expelled
when the TEST Button is pressed.
Increase the duration for which the
solenoid purge valve opens.
Solenoid valve plug clogged.
No condensates or air are expelled
when the TEST Button is pressed.
Clean the solenoid valve
The relay on the electronic board which
controls the solenoid valve does not
function.
Use a voltmeter to check if the relay
contacts do not close when the TEST
button is pressed
Replace the electronic board if the
relay does not function.
Distribution network pipework is in a "cold"
environment in which the temperature is
lower than the dew point temperature of
the compressed air under pressure and
the tubes are not lagged. In this case,
condensates form on the internal surfaces
of the pipes.
The drier functions problem-free.
The cause of the problem is external.
Lag the pipework in "cold"
environments.
Condensates
present
downstream
from the drier
